EP3857070B1 - Oil-injected multistage compressor device and method for controlling such a compressor device - Google Patents

Oil-injected multistage compressor device and method for controlling such a compressor device Download PDF

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Publication number
EP3857070B1
EP3857070B1 EP19780415.6A EP19780415A EP3857070B1 EP 3857070 B1 EP3857070 B1 EP 3857070B1 EP 19780415 A EP19780415 A EP 19780415A EP 3857070 B1 EP3857070 B1 EP 3857070B1
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EP
European Patent Office
Prior art keywords
oil
pressure stage
stage compressor
compressor element
outlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19780415.6A
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German (de)
English (en)
French (fr)
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EP3857070A1 (en
Inventor
Stijn Broucke
Pieter De Schamphelaere
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Atlas Copco Airpower NV
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Atlas Copco Airpower NV
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Publication of EP3857070A1 publication Critical patent/EP3857070A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F04C29/042—Heating; Cooling; Heat insulation by injecting a fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B25/00—Multi-stage pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B25/00—Multi-stage pumps
    • F04B25/005—Multi-stage pumps with two cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/02—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for several pumps connected in series or in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/026—Lubricant separation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/028—Means for improving or restricting lubricant flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/19—Temperature
    • F04C2270/195—Controlled or regulated

Definitions

  • the present invention relates to an oil-injected multistage compressor.
  • the cooling could be improved by, for example, additional active cooling. This entails effectively extracting heat from the system instead of only adding a coolant to the system that takes heat from the gas.
  • This pressure loss increases due to the presence of oil in the gas, particularly due to the fact that the oil has a higher viscosity than air.
  • the pressure loss will depend on the quantity of oil in the gas: the more oil in the gas, the greater the pressure loss in the intercooler.
  • WO 02/25115 discloses a multiple stage compressor with oil injection and an intercooler between the two stages.
  • the object of the present invention is to provide a solution to at least one of the aforementioned and other disadvantages by providing an oil-injected multistage compressor device, in which there will be an active cooling for which the aforementioned pressure loss will not be a problem.
  • the subject of the present invention is an oil-injected multistage compressor device that comprises at least one low-pressure stage compressor element with an inlet and an outlet and a high-pressure stage compressor element with an inlet and an outlet, whereby the outlet of the low-pressure stage compressor element is connected to the inlet of the high-pressure stage compressor element by a conduit, with the characteristic that in the aforementioned conduit between the low-pressure stage compressor element and the high-pressure stage compressor element an intercooler is provided and that the compressor device is also equipped with a restriction for limiting the amount of oil injected into the low-pressure stage compressor element.
  • An advantage is that the restriction can limit the amount of oil injected into the low-pressure stage compressor element.
  • the restriction can be implemented in many ways, such as a local constriction in the relevant oil supply conduit.
  • the restriction is preferably done by a valve that can regulate the amount of oil injected into the low-pressure stage compressor element, so that always only the minimum amount of the required oil is injected and not more than necessary.
  • valve When conditions demand, the valve can allow more oil to be injected in order to avoid overheating. In all other cases, it is possible to switch to the minimum injection.
  • the presence of the intercooler means that less oil is needed for cooling, since the intercooler can take over part of the cooling that was previously done by the oil. Because less oil is needed and injected, the pressure loss in the intercooler will also be limited.
  • the compressor device prefferably equipped with an oil separator provided in the conduit upstream from the intercooler in order to separate oil.
  • the invention also relates to a method for controlling an oil-injected multistage compressor device that comprises at least one low-pressure stage compressor element with an inlet and an outlet and a high-pressure stage compressor element with an inlet and an outlet, whereby the outlet of the low-pressure stage compressor element is connected to the inlet of the high-pressure stage compressor element via a conduit, with the characteristic that in the aforementioned conduit between the low-pressure stage compressor element and the high-pressure stage compressor element an interncooler is provided and that the compressor device is also equipped with a restriction for limiting the amount of oil injected into the low-pressure stage compressor element and with the characteristic that the method comprises the following steps:
  • Figure 1 shows the schematic for an oil-injected multistage compressor device according to the invention
  • the Figure 1 schematic for the oil-injected multistage compressor device 1 comprises two steps or 'stages' in this case: a low-pressure stage with a low-pressure stage compressor element 2 and a high-pressure stage with a high-pressure stage compressor element 3.
  • Both compressor elements 2, 3 are, for example, screw compressor elements, but this is not necessary for the invention.
  • Both compressor elements 2, 3 are also provided with an oil circuit for the injection of oil in compressor elements 2, 3.
  • oil circuits are not or only partially shown in the Figure.
  • Low-pressure stage compressor element 2 has an inlet 4a for gas and an outlet 5a for compressed gas.
  • Gas outlet 5a is connected to inlet 4b of high-pressure stage compressor element 3 via a conduit 6.
  • High-pressure stage compressor element 3 is also equipped with an outlet 5b, whereby outlet 5b is connected to a liquid separator 7.
  • outlet 8 of this liquid separator 7 It is possible for outlet 8 of this liquid separator 7 to be connected to an aftercooler.
  • An intercooler 9 is included in the aforementioned conduit 6 between low-pressure stage compressor element 2 and high-pressure stage compressor element 3.
  • Compressor device 1 is also equipped with a restriction 10 for limiting the quantity of oil injected into low-pressure stage compressor element 2.
  • this restriction 10 is carried out with a valve 10, which will allow the regulation of the amount of oil to be injected.
  • a passive or nonregulatable restriction 10 is applied instead of a valve 10, for example in the form of a narrowing in the conduit at the point where valve 10 is usually located.
  • the aforementioned valve 10 can be an open-closed regulatable valve or a continuously regulatable valve.
  • a control unit or regulator 11 is provided for controlling or regulating this valve 10.
  • a temperature sensor 12 is also provided which may determine or measure the temperature at outlet 5a of low-pressure stage compressor element 2. This sensor 12 is connected to the aforementioned control unit or regulator 11.
  • compressor device 1 is equipped with an oil separator 13, which is provided in conduit 6 upstream from intercooler 9 for separating the oil that is injected into low-pressure stage compressor element 2.
  • An oil conduit 14 is also provided which runs from this oil separator 13 towards low-pressure stage compressor element 2 in order to direct the oil separated by oil separator 13 via this oil conduit 14 to low-pressure stage compressor element 2 to be injected into the low-pressure stage compressor element 2 there.
  • this oil conduit 14 may run from oil separator 13 to liquid separator 7 downstream from high-pressure stage compressor element 3.
  • Such an oil conduit 14a will guide the oil separated by oil separator 13 via this oil conduit 14a to liquid separator 7. It is not excluded for an oil pump 14b or the like to be used for displacing the oil.
  • both an oil cooler 15 and a filter 16 will be provided in oil conduit 14.
  • the filter 16 can filter out any impurities in the oil before the oil is reinjected into compressor element 2.
  • An oil return conduit 17 is also provided, which leaves from liquid separator 7 with a branch 17a to high-pressure stage compressor element 3 and a branch 17b to low-pressure stage compressor element 2.
  • oil conduit 14 joins with branch 17b at point P, whereby the aforementioned oil cooler 15 and filter 16 are included upstream from point P in oil conduit 14.
  • both the oil cooler 15 and filter 16 can be included downstream from point P in oil conduit 14, so that both the oil from liquid separator 7 and the oil from oil separator 13 are cooled and filtered by oil cooler 15 and filter 16 respectively.
  • oil conduit 14a can also be provided with an oil cooler 15 and a filter 16.
  • the operation of the oil-injected multistage compressor device 1 is very simple and is as follows: During operation, compressed gas, e.g. air, will be sucked in via inlet 4a of low-pressure stage compressor element 2 and will undergo a first compression stage.
  • compressed gas e.g. air
  • the partially compressed. gas will flow through conduit 6 to intercooler 9, where it will be cooled and then flow to inlet 4b of high-pressure stage compressor element 3, where it will undergo a subsequent compression.
  • Oil will be injected in both low-pressure stage 2 and high-pressure stage compressor element 3, which will ensure the lubrication and cooling of compressor elements 2, 3.
  • the compressed gas will leave high-pressure stage compressor element 3 via outlet 5b and be guided to oil separator 7.
  • the injected oil will be separated and the compressed gas can then possibly be guided to an aftercooler before being sent to consumers.
  • valve 10 will. be controlled by control unit 11 so that temperature T outlet at outlet 5a of low-pressure stage compressor element 2 remains below a specific value T max .
  • the first step will be to determine the temperature T outlet .
  • This temperature T outlet will in this case be measured directly with sensor 12.
  • this temperature T outlet it is clear that there are other ways to determine this temperature T outlet .
  • it can also be determined or calculated from the temperature after intercooler 9 or based on environmental parameters and working conditions of low-pressure stage compressor element 2.
  • the method for controlling valve 10 is then further as follows:
  • valve 10 is an open-closed valve, oil will either be injected or not.
  • valve 10 is continuously regulatable, the flow rate of the oil can be precisely adjusted to meet the current requirement.
  • This ability to regulate ensures that a minimum oil injection is always obtained.
  • valve 10 in the example described above is carried out on the basis of the temperature T outlet , it is not excluded for the control to be based on the power or efficiency.
  • valve 10 will be controlled by control unit 10 so that the power or efficiency remains above a certain value P max or E max , to ensure that there is no large loss of pressure in intercooler 9.
  • the method in this case will also include the step of separating oil downstream of low-pressure stage compressor element 2 and upstream of intercooler 9 with the help of oil separator 13.
  • This separated oil will then be discharged to low-pressure stage compressor element 2 via oil conduit 14.
  • Oil conduit 14 will meet branch 17b of return conduit 17 at point P in order to go to valve 10 and ultimately to low-pressure stage compressor element 2.
  • the method can include the step of separating the oil downstream from low-pressure stage compressor element 2 and upstream from intercooler 9 using oil separator 13 and subsequently pumping this to liquid separator 7 downstream from high-pressure stage compressor element 3.
  • the gas can always be actively cooled with intercooler 9 before it goes to high-pressure stage compressor element 3 without this being accompanied by significant pressure loss and therefore a loss of efficiency.
  • the compressor device is only provided with oil separator 1.3 with additional oil conduit 14 or 14a and not with valve 10 which regulates the oil injection.
  • the present invention is by no means limited to the embodiments described as examples and shown in the figures, but an oil-injected multistage compressor device according to the invention, and a method for controlling such a compressor device can be achieved following different variants without going beyond the scope of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
EP19780415.6A 2018-09-25 2019-09-24 Oil-injected multistage compressor device and method for controlling such a compressor device Active EP3857070B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE20185658A BE1026652B1 (nl) 2018-09-25 2018-09-25 Oliegeïnjecteerde meertraps compressorinrichting en werkwijze om een dergelijke compressorinrichting aan te sturen
PCT/IB2019/058063 WO2020065505A1 (en) 2018-09-25 2019-09-24 Oil-injected multistage compressor device and method for controlling such a compressor device

Publications (2)

Publication Number Publication Date
EP3857070A1 EP3857070A1 (en) 2021-08-04
EP3857070B1 true EP3857070B1 (en) 2023-07-05

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EP19780415.6A Active EP3857070B1 (en) 2018-09-25 2019-09-24 Oil-injected multistage compressor device and method for controlling such a compressor device

Country Status (12)

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US (1) US11371507B2 (nl)
EP (1) EP3857070B1 (nl)
JP (1) JP7164711B2 (nl)
KR (1) KR102534549B1 (nl)
CN (2) CN211623712U (nl)
BE (1) BE1026652B1 (nl)
BR (1) BR112021005372B1 (nl)
DK (1) DK3857070T3 (nl)
ES (1) ES2958916T3 (nl)
FI (1) FI3857070T3 (nl)
TW (1) TWI748246B (nl)
WO (1) WO2020065505A1 (nl)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1026652B1 (nl) * 2018-09-25 2020-04-28 Atlas Copco Airpower Nv Oliegeïnjecteerde meertraps compressorinrichting en werkwijze om een dergelijke compressorinrichting aan te sturen
BE1026654B1 (nl) * 2018-09-25 2020-04-27 Atlas Copco Airpower Nv Oliegeïnjecteerde meertraps compressorinrichting en werkwijze voor het aansturen van een compressorinrichting
CN113266572A (zh) * 2021-07-01 2021-08-17 阿特拉斯·科普柯(无锡)压缩机有限公司 气体压缩系统
CN116677606B (zh) * 2023-08-03 2023-10-20 德耐尔节能科技（上海）股份有限公司 一种双螺杆两级压缩自适应喷油装置

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JP7164711B2 (ja) 2022-11-01
US11371507B2 (en) 2022-06-28
BE1026652A1 (nl) 2020-04-20
BR112021005372A2 (pt) 2021-06-15
TW202018188A (zh) 2020-05-16
BR112021005372B1 (pt) 2024-04-30
BE1026652B1 (nl) 2020-04-28
EP3857070A1 (en) 2021-08-04
KR102534549B1 (ko) 2023-05-18
KR20210047352A (ko) 2021-04-29
TWI748246B (zh) 2021-12-01
US20210246900A1 (en) 2021-08-12
JP2022500591A (ja) 2022-01-04
CN110939570B (zh) 2021-09-28
CN211623712U (zh) 2020-10-02
CN110939570A (zh) 2020-03-31
DK3857070T3 (da) 2023-10-16
ES2958916T3 (es) 2024-02-16
FI3857070T3 (fi) 2023-10-02
WO2020065505A1 (en) 2020-04-02

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